Radiosity shades objects based on the energy distribution in the scene resulted from a lighting simulation, therefore a process to convert the energy distribution of a range of 0-100,000 (lux) to 256 levels of color is needed. With OptGraph Radiosity Library, this process is done based on an illuminance (average illuminance value) of which all the initially existing light energy in the scene is distributed evenly on the objects in the scene. This is the specification to enable some calculation even if the lumen value of the actual lighting is not input exactly, and to use Radiosigy more easily. However, like your question, when the light sources are increased, both the energy value in the scene and the average illuminance value that is the standard of calculation become higher. Therefore, those two effects are offset each other and the total illuminance as a result of the Radiosity calculation does not change. The current specification is on the assumption that users correct colors and adjust illuminance after the Radiosity calculation. However, Radiosity will be improved to choose an absolute standard as a calculation option in addition to a relative standard in the current specification.

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1. What is Radiosity ?
2. The Radiosity calculation result doesn't become brighter even though light sources are increased in the scene.
3. What is an important reminder to generate model data for Radiosity calculation ?
4. Why is it a problem, whether front or back of the surface, in Radiosity calculations ?
5. Why some surfaces were displayed as black after Radiosity calculation ?
6. When is the completion point of Radiosity calculation ?
7. How to deal with the texture-mapping or the bump-mapping in Radiosity calculations.
8. What is the relation between Radiosity and Ray Tracing when using them together ?